HP ProBook 450 G4 Notebook PC and HP ProBook 455 G4 Notebook PC - Maintenance and Service Guide

TouchPad assembly
Description Spare part number
TouchPad assembly
NOTE: The TouchPad is included in the Top Cover spare part kit.
not spared
TouchPad assembly cable (included in Cable Kit) 905769-001
Before removing the TouchPad assembly, follow these steps:
1. Shut down the computer. If you are unsure whether the computer is o or in Hibernation, turn the
computer on, and then shut it down through the operating system.
2. Place the computer in “Battery Safe mode” (Battery Safe mode on page 32).
3. Disconnect all external devices connected to the computer.
4. Disconnect the power from the computer by rst unplugging the power cord from the AC outlet, and
then unplugging the AC adapter from the computer.
5. Remove the following components:
a. Service door (see Service door on page 33).
b. Optical drive (Optical drive on page 34)
c. Hard drive (Hard drive on page 36)
d. Keyboard (see Keyboard on page 45)
e. Top cover (see Top cover on page 52)
Remove the TouchPad assembly:
NOTE: Before you remove the TouchPad assembly, make sure nothing (memory card or plastic insert) in
installed.
1. Position the top cover upside-down.
2. Disconnect the cable from the connector on the TouchPad (1).
3. Remove the 4 Phillips PM2.5×3.0 screws (2) that secure the TouchPad to the top cover.
4. Rotate the top of the TouchPad upward (3), and then pull the board toward the top of the top cover to
remove it (4).
64 Chapter 6 Removal and replacement procedures for Authorized Service Provider parts